Willaed d



(Mode1.)

W. D. DOVREMUS.

LOCK.

.No. 243,871. Patented July 5, 1881.

Jy X

WITNESSES INVENTOR ATTORNEYS.

UNITED STATES PATENT OFFICE.

WILLARD D. DOREMUS, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR TO THE EAGLE LOCK COMPANY, OF TERRYVILLE, CONNECTICUT.

LOCK.

SPECIFICATION forming part of Letters Patent No. 243,871, dated July 5, 1881. Application filed April 15, 1881. (ModeL) To all whom it may concern:

Be it known that I, WILLARD D. DoREMUs, of Washington city, Districtof Columbia, have invented a new and useful Improvement in Locks and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a sectional view of so much of a look as is necessary to illustrate my invention. Fig. 2 is a sectional view through the line as w of Fig.1, looking in the direction of the arrow, and the key being removed. Fig. 3 is a similar view with the sleeve and disk removed. Figs. 4 and 5 are details of the sleeve and disk.

The object of my invention is to provide a lock which shall be so constructed that after the key is started to be moved forward to unlock the bolt it cannot be moved back again, but must complete its revolution before it can be withdrawn.

It consists in a lock having a sleeve arranged concentrically with the axial portion of the key-hole, which sleeve receives the axial portion of the key, and has a slot or outlet in the side to give room for the key-bit, and

to which sleeve is fixed aratchet-wheel adapted to engage with a pawl so arranged within the case that the wheel covers and protects it against any efforts to tamper with the same, all as hereinafter more fully described.

In the drawings, A represents the front, and B the back, plate of any of the ordinary forms of locks. As these two plates are the only parts of a lock thathave any special connection with the devices which constitute my invention, I have not thought it necessary to show a complete lock.

To the back plate, B, is fixed the key-pina, and around this key-pin there is formed, in the back plate, a circular depression containing a circular flat spring, 1), whose end is slightly raised, so as to form a detent. Around the key-pin is arranged a sleeve, 0, which has on its rear end a disk, 0, having upon its side next to the back plate a circular series of ratchet-teeth. This disk is just of a size to fit in the circular recess in the back plate, and its teeth are engaged by the spring-detent in said recess, so that the disk can only revolve in one direction. The sleeve 0 turns on an en* larged boss at the base of the key-pin at the back end, and at the other end turns in the front plate, so that it does not hear at all upon the key-pin proper, but leaves room enough between its inner face and the key-pin to receive the barrel of the key. To allow the key to thus slip in between these two parts (the sleeve and key-pin) the sleeve is slotted so that the bit of the key can pass through, and which hit, resting in said slot, causes the sleeve and ratchet-disk to be turned whenever the key is turned. Now, it will be seen that as soon as the key is turned away from the key-hole to unlock the bolt the sleeve and disk are turned, and as each successive tooth in the disk is caught by the spring-detent the movement of the key is taken up as fast as it is made, and the key is held against back movement. This is a feature which has value more particularly in the class of indicator-locks where the key is made to actuate a set of register-wheels, the change of whose figures indicates any opening of the lock, andin which caseit is specially desirable that the key should not be turned backward, for the reason that it might allow the indicator-wheels to be restored to the same symbols showing before the opening of the lock, and thus defeat the object of the indicators.

In making use of my invention I may place the ratchet-disk against the front plate, instead of the back plate, as shown.

I do not claim, broadly, a detent for preventing the back movement of the key. A peculiarity and great advantage of my construction, however, is that the detent is entirely obscured or housed between the disk and front or back plate, as the case may be, so that it is not accessible and cannot be picked or-tampered with.

Having thus described my invention, what I claim as new is- A sleeve arranged concentrically with the axial part of the key-hole, and having a slot or outlet in its side and a, toothed disk at one end, combined with the two walls of a lock, and a spring located between one of the Walls of the lock and the adjacent face of said disk, substantially as and for the purpose described.

W. D. DOREMUS. 

